import java.util.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
class a2{
   
    /*
    [[5,4],[6,3],[6,7],[6,6]]
    */
    public static void main(String[] args) {
        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String s =br.readLine();
            
        
        } catch (Exception e) {
            //TODO: handle exception
            System.out.println("error");
        }
        
    }




}